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Sample size determination or estimation is the act of choosing the number of observations or replicates to include in a statistical sample. The sample size is an important feature of any empirical study in which the goal is to make inferences about a population from a sample. In practice, the sample size used in a study is usually determined ...
A visual representation of the sampling process. In statistics, quality assurance, and survey methodology, sampling is the selection of a subset or a statistical sample (termed sample for short) of individuals from within a statistical population to estimate characteristics of the whole population. The subset is meant to reflect the whole ...
Student's t-test is a statistical test used to test whether the difference between the response of two groups is statistically significant or not. It is any statistical hypothesis test in which the test statistic follows a Student's t -distribution under the null hypothesis. It is most commonly applied when the test statistic would follow a ...
YouGov denied that the poll was spiked for political reasons, instead arguing that the poll was based on a "skewed sample". [38] Former YouGov president Peter Kellner confirmed last-minute small methodology changes which transferred 2% from Labour to Conservative and increased the predicted Conservative lead from 3% to 7%.
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Rates for a 15-year mortgage stand at an average 6.00% for purchase and 6.07% for refinance, down 33 basis points from 6.33% for purchase and 27 basis points from 6.34% for refinance this time ...
Given an r-sample statistic, one can create an n-sample statistic by something similar to bootstrapping (taking the average of the statistic over all subsamples of size r). This procedure is known to have certain good properties and the result is a U-statistic. The sample mean and sample variance are of this form, for r = 1 and r = 2.
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